Ink pad for stencil duplicators



Aug. 5, 1947. R. L. JOHNSON -INK FOR STENCIL DUPLICATORS Filed July 51, 1944 m. m n m,

Fallo/1 Lfdglmfon f77/ORN Patented Aug. 5, 1947 UNITED PATENT OFFICE ",Z.,42,1i,98is .INK BAD `FOR STENCIL vDlUlELICAJIRS Ralph L. Johnson, Brockton,.Mass-.

lApplication July 31,.1944,'.Se1ial'N0., 547,475

`3 Claims. (Cl. 10i-125) (Granted under fthe act of March s, 1883, as amended April A30, 1928.; 370 0. G. 757) The invention described herein, if patented may Abe manufactured Aand used by or for Athe Government for governmental purposes, withoutfthe payment tome of any royalty thereon.

The presentinvention relates to a stencil printer for reproducing typewritten and vdrawn matter 'from stencil sheets and'has for its primary object toprovide an inexpensive construction Yof printer for use ina more or less minor Vcapacity Where yonlysmall yruns are'required, or where astandard duplicating machine is not available.

To this end it is a further object ofthe invention to provide a. stencil printer which :isnot'only composed of readily available material 'but 'also one which is composed lof relatively inexpensive materials which may be easily Aand quickly 'assembled linto the completed articles.

Another object of the `invention resides inthe use of relatively narrow strips of limpervious or ink-repellent material applied to certain 'of the edges of the duplicating `device to prevent the ink from spreading, and thereby avoiding contamination of the stencil and related parts.

A further object of the invention Vconsists in the use of removable strips orf duplicating'paper applied over vthe Ystrips-of `ink-repellent material and overlapping to some extent the operative surface of the duplicator to further lessen the -possibility of contamination of the stencil, etc.

Other objects andadvantages -of the invention will be apparent from the following description when taken in connection withthe accompanying drawings, in which,

Figure 1 is a perspective view of the novel duplicating device, showing a portion o-f a conventional stencil sheet in position thereon.

Figure 2 is a longitudinal sectional view taken on line 2-2 of Figure 1, on an enlarged scale.

Figure 3 is a transverse sectional View taken on line 3-3 of Figure 1, and

Figure 4 is a plan view of the printer with parts broken away,

Referring to the drawings in greater detail and particularly to Figures 2 and 3, the numeral I indicates a wood base or backing member for the printer, which, in accordance with. the present invention, is formed of plywood so as to eliminate warping. Mounted upon the upper face of the backing I and coextensive therewith except for a space of about 21/2 inches at the head of the base member, is a cushion 2. This cushion is formed of paper laminations, preferably newspaper, and should have a thickness of about of an inch to provide the most favorable cushioning effect. An ordinary stapling machine, used as a tacker, may

'2 Vbe conveniently employed 'for inserting staples 3 `to permanently secure the cushion pad to the A'backing member I.

The-numeral 1l indicates a sheet'of ink-repellent material such as oil-board, which is an oilimpregnated paper often used'in stencilling crates and the like, and which provides an excellent shield for the cushion 2. This impervious sheet rextends throughout the length and width of the 'base member l and may have its ends passed 'around the ends ofthe-base 4l and'secured to the under-side thereof ass'hown in Figures 1 and 2. 'Screwsd spaced transversely of the base member in accordance with the spacing of the apertures of the conventional stencil sheet, also serve to secure the oil-board `to the vbacking member at its upper end, and the side `edges of this covering -sheet may be secured `to the lbacking by series of -s'taples'orithe like. It will be understood of course `that'the heads of the lscrews 5 rare spaced above 'the impervious sheet d so as to provide an anchoring means for the conventional stencil sheets to lbeused with the printer.

Mounted on the sheet i and coextensive with the-cushion 2 is a sheet of absorbent rmaterial 6 used as a reservoir for a moderate supply of ink and fas a dispenser thereof through the stencil `yto-the sheet beingprinted. Thissheet is likewise tacked to the base member l by a stapling machine or the like, and it is desirable to employ double rows of closely-spaced'staples forthis purposes'oas to v:firmly and securely Vanchor the sheet. The material `used for the ink-retaining sheet E5 is preferably flannel as it shrinks slightly when moistened, thereby providing a taut, smooth surface and eliminating any possibility of wrinkles which would greatly interfere with the accurate reproduction, of the designs or the like formed on the stencil.

It will be understood of course that in use, the flannel sheet 6 is saturated with ink, and in order to avoid excessive spreading of the ink beyond the operative surface of the printer, relatively narrow strips 'l of ink-repellent material, such as oil-board, are arranged to overlie and engage the longitudinal margins and lower margin of the ink-retaining sheet. These strips are secured in position by series of staples or the like 8 which are located adjacent the inner edges of the strips so as to insure close contact between the strips and annel sheet along the three edges referred to. Wood strips 9 are preferably mounted upon the strips l' at the three edges thereof to further secure the lattenin place and to provide a suitable finish for the device.

A supplemental means which may be used to avoid excessive spreading of the ink consists of strips l of duplicating paper. Such strips are placed over the oil-board strips and extend from the inner edges` of the wood strips 9 to a point slightly under the stencil sheet when placed in position on the printer. These paper strips are usually serviceable for one series of operations, after. which lthey have generally become suciently ink-saturated to require replacement. In ordinary operation it is desirable to employ new strips l0 at the initiation of each series of operations.

The purpose and function of each of the several elements of the printer have been fully described in connection with the detailed description of its construction and need not be repeated. Suffice it to say that after the iiannel sheet E is saturated with ink, the stencil ll is inverted and the openings in its heading are passed over the screws 5. The sheet to be printed is then applied to the stencil and rolled once with a photographic print roller or the like. In this operation the roller is placed at the end of the paper adjacent the screws 5, where the stencil is anchored, and moved toward the opposite end thereof, and it is desirable to raise the paper immediately behind the roller so as to avoid excessively heavy reproductions. After the particular series of reproductions has been completed, it is usual to remove the strips l0, which have become saturated with ink, as heretofore indicated, and apply new strips I0 when the device is to be again placed in operation.

Fromk the foregoing description taken in connection with the accompanying drawings it will be apparent to those skilled in the art that I have devised an exceedingly simple and inexpensive stencil printer formed of relatively few parts, and yet one which is provided in a simple manner with suiicient safeguards to insure highquality reproductions.

In accordance with the patent statutes I have described what I nowbelieve to be the preferred form of the invention, but inasmuch as various minor changes may be madein the details of construction without departing from the spirit `Ving, absorbent material and narrow strips, and

wood strips for further clamping said strips of impervious material on the edges of the absorbent sheet.

2. A stencil printer including a base member of plywood, a cushion member comprised of a pad of newspapers mounted on the base member,

' -a sheet of oil-board covering the cushion member, a sheet of absorbent material disposed upon the sheet of oilboard, relatively narrow strips of impervious material mounted on the face of the absorbent material at certain of the edges thereof, and rows of closely spaced staples for fastening together said base member, cushion member, oil-board covering, absorbent material and narrow strips.

3. A stencil including a base member, a cushion member mounted thereon but spaced from one end thereof, a sheet of impervious material covering the cushion member and the exposed portion of the base member, a plurality of fastening means for securing an end of the impervious sheet to the exposed portion of the base member, said fastening means being spaced a substantial distance from the adjacent edge of the cushion member, and being spaced transversely of the base member in accordance with the spacing of the openings in conventional stencil sheets, a sheet of absorbent material csc-extensive with the cushion member and mounted on the impervious sheet, and relatively narrow stripsI of impervious material mounted on the face of the absorbent sheet at certain of the edges thereof.

RALPH L. JOHNSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 416,174 Meriman Dec. 3, 1889 1,465,616 Schulthorp Aug. 21, 1923 641,495 Burnell June 16, 1900 826,733 Moore July 24, 1906 Borregard Jan. '7, 1930 

